Automobile rear bumper



FIG. 1 is a perspective view of an automobile rear bumper showing my new design;

FIG. 2 is a front elevation view; and,

FIG. 3 is a side elevation view.

The rear view of the surface that faces the automobile when installed is omitted and is not part of the claimed design. 

The ornamental design for an automobile rear bumper, as shown and described. 